393
FNCA52 TJSJ 190859
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
459 AM AST SUN JUL 19 2026
DISCUSSION
A FIRE DANGER STATEMENT (RFD) IS IN EFFECT. CRITICALLY DRY FUELS
AND SIGNIFICANT SOIL MOISTURE DEFICITS PERSIST ACROSS PORTIONS OF
SOUTHERN PUERTO RICO, WITH KBDI VALUES REMAINING ABOVE CRITICAL
THRESHOLDS. ALTHOUGH A WEAK TROPICAL WAVE APPROACHING FROM THE
EAST WILL RESULT IN A SLIGHT INCREASE IN LOW-LEVEL MOISTURE LATER
TODAY, THE DEEPEST MOISTURE IS EXPECTED TO REMAIN WELL SOUTH OF
THE LOCAL ISLANDS, WITH LITTLE IMPACT ON FIRE WEATHER CONDITIONS
THROUGH MOST OF THE DAY.
RELATIVE HUMIDITY VALUES ARE STILL FORECAST TO FALL INTO THE UPPER
40S TO LOWER 50S THIS AFTERNOON ACROSS THE SOUTHERN COASTAL PLAINS
OF PUERTO RICO AND ADJACENT LOWER ELEVATIONS, WHILE EASTERLY TO EAST-
NORTHEASTERLY WINDS OF 15 TO 20 MPH WITH HIGHER GUSTS WILL CONTINUE
TO SUPPORT ELEVATED FIRE WEATHER CONDITIONS. ANY RAINFALL ASSOCIATED
WITH THE TROPICAL WAVE IS EXPECTED TO BE LIGHT AND LOCALIZED,
PROVIDING LITTLE TO NO MEANINGFUL RELIEF TO THE ONGOING DRY
CONDITIONS. RESIDENTS AND VISITORS SHOULD AVOID OUTDOOR BURNING AND
EXERCISE CAUTION WHEN USING OPEN FLAMES OR OTHER POTENTIAL IGNITION
SOURCES.
PRZ014-192015-
SOUTHEAST COASTAL PLAINS-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 92 (+1) 74 (-3) 91
RH % (24H TREND) 45 (-6) 88 (+6) 49
WIND 20FT/EARLY(MPH) E 14 G22 E 13 E 16 G23
WIND 20FT/LATE(MPH) E 17 G26 NE 10 E 17 G25
MIXING HGT(FT-AGL/MSL)5530 5760
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 82950 80640
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-192015-
SOUTHERN HILLS-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 90 (+3) 70 (-3) 89
RH % (24H TREND) 53 (-7) 95 (+6) 58
WIND 20FT/EARLY(MPH) E 14 E 13 E 16
WIND 20FT/LATE(MPH) E 14 NE 13 E 14
MIXING HGT(FT-AGL/MSL)6180 6740
TRANSPORT WND (MPH) E 15 E 15
VENT RATE (KT-FT) 80340 87620
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-192015-
NORTH COASTAL PLAINS-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 10
TEMP (24H TREND) 90 (0) 73 (-3) 89
RH % (24H TREND) 57 (-6) 94 (+4) 61
WIND 20FT/EARLY(MPH) E 16 E 20 E 17
WIND 20FT/LATE(MPH) E 21 E 16 E 18
MIXING HGT(FT-AGL/MSL)5290 4880
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 79350 73200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-192015-
NORTHERN HILLS-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 20
TEMP (24H TREND) 90 (+1) 71 (-2) 89
RH % (24H TREND) 57 (-5) 96 (+2) 63
WIND 20FT/EARLY(MPH) E 13 E 18 E 14
WIND 20FT/LATE(MPH) NE 19 E 12 NE 17
MIXING HGT(FT-AGL/MSL)6480 6060
TRANSPORT WND (MPH) E 14 E 14
VENT RATE (KT-FT) 77760 72720
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-192015-
WEST COAST-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 40
TEMP (24H TREND) 93 (+2) 73 (0) 92
RH % (24H TREND) 56 (-5) 94 (+1) 60
WIND 20FT/EARLY(MPH) E 13 E 17 E 13
WIND 20FT/LATE(MPH) E 14 E 13 E 13
MIXING HGT(FT-AGL/MSL)5360 6000
TRANSPORT WND (MPH) E 9 E 9
VENT RATE (KT-FT) 42880 48000
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-192015-
EASTERN INTERIOR-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 89 (+1) 72 (-3) 89
RH % (24H TREND) 56 (-5) 96 (+6) 59
WIND 20FT/EARLY(MPH) E 16 E 13 E 16
WIND 20FT/LATE(MPH) E 13 E 13 E 14
MIXING HGT(FT-AGL/MSL)6400 6030
TRANSPORT WND (MPH) E 16 E 16
VENT RATE (KT-FT) 89600 84420
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-192015-
LUQUILLO MOUNTAIN RANGE-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 40
TEMP (24H TREND) 85 (+3) 69 (-4) 85
RH % (24H TREND) 62 (-11) 99 (+5) 67
WIND 20FT/EARLY(MPH) E 13 E 11 E 13
WIND 20FT/LATE(MPH) E 12 E 11 E 13
MIXING HGT(FT-AGL/MSL)4840 4940
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 72600 69160
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-192015-
CENTRAL MOUNTAIN RANGE-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 0 30
TEMP (24H TREND) 88 (+3) 68 (-2) 88
RH % (24H TREND) 58 (-7) 98 (+3) 64
WIND 20FT/EARLY(MPH) E 9 E 13 E 10
WIND 20FT/LATE(MPH) E 13 E 11 E 10
MIXING HGT(FT-AGL/MSL)8150 7430
TRANSPORT WND (MPH) E 9 E 12
VENT RATE (KT-FT) 65200 74300
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-192015-
CAYEY MOUNTAIN RANGE-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 30
TEMP (24H TREND) 85 (+1) 69 (-4) 85
RH % (24H TREND) 61 (-7) 99 (+3) 65
WIND 20FT/EARLY(MPH) E 12 E 12 E 14
WIND 20FT/LATE(MPH) E 12 E 10 E 14
MIXING HGT(FT-AGL/MSL)5490 5730
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 82350 85950
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-192015-
VIEQUES-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 40
TEMP (24H TREND) 90 (+1) 79 (-1) 90
RH % (24H TREND) 55 (-8) 83 (+1) 57
WIND 20FT/EARLY(MPH) E 18 E 18 E 17
WIND 20FT/LATE(MPH) E 17 E 18 E 16
MIXING HGT(FT-AGL/MSL)3570 3200
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 57120 51200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-192015-
CULEBRA-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 90 (+2) 78 (-2) 90
RH % (24H TREND) 57 (-8) 89 (+5) 59
WIND 20FT/EARLY(MPH) E 18 E 17 E 17
WIND 20FT/LATE(MPH) E 16 E 17 E 14
MIXING HGT(FT-AGL/MSL)3540 3260
TRANSPORT WND (MPH) E 21 E 20
VENT RATE (KT-FT) 63720 55420
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-192015-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 92 (+1) 74 (-2) 92
RH % (24H TREND) 47 (-9) 85 (+6) 49
WIND 20FT/EARLY(MPH) E 16 G23 E 12 E 16 G23
WIND 20FT/LATE(MPH) SE 18 G27 E 9 SE 16 G24
MIXING HGT(FT-AGL/MSL)5610 6260
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 78540 81380
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-192015-
SAINT THOMAS AND SAINT JOHN-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 87 (0) 75 (-2) 86
RH % (24H TREND) 59 (-8) 95 (+6) 63
WIND 20FT/EARLY(MPH) E 19 E 18 E 18
WIND 20FT/LATE(MPH) E 17 E 18 E 14
MIXING HGT(FT-AGL/MSL)3520 3160
TRANSPORT WND (MPH) E 25 E 18
VENT RATE (KT-FT) 77440 50560
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-192015-
ST CROIX-
459 AM AST SUN JUL 19 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 30
TEMP (24H TREND) 90 (+2) 76 (-1) 90
RH % (24H TREND) 58 (-9) 93 (+2) 59
WIND 20FT/EARLY(MPH) E 18 E 18 E 17
WIND 20FT/LATE(MPH) E 16 E 18 E 14
MIXING HGT(FT-AGL/MSL)4830 4810
TRANSPORT WND (MPH) E 21 E 17
VENT RATE (KT-FT) 86940 72150
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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